class_docstr: Tests for bbox_overlap
  bbox_overlap has a TensorFlow and a Numpy implementation.
  
  We test both at the same time by getting both values and making sure they
  are both equal before doing any assertions.
code: def tearDown(self):
      tf.reset_default_graph()
  
file_path: luminoth/luminoth/utils/bbox_overlap_test.py
imports: import numpy
  import tensorflow
  from luminoth.utils.bbox_overlap import bbox_overlap_tf, bbox_overlap
label_desc: Use image node_id 1 for calling the BBoxOverlapTest obj's underlying member method code with example usage: obj.tearDown() without return types